the end of the day can't come soon enough

So, I'm in the middle of a pretty serious project at work and I really don't want to be involved. Without giving out any potentially sackable information: we're changing banks and I'm part of a group of people that is supposed to make the transition seamless for our business.
Considering the size of the project and the potential impact (on both staff and customers) I'm really not comfortable having to read through lengthy business requirements docs to see if they suit.

The problem is, I'm just a pleb.

I joined the company as an Accounts Officer 2 1/2 years ago. I picked up the skills pretty quickly, as it was pretty linear kind of work. I was quick and accurate at my job and knew how most of our processes worked, so when a team senior role became available I jumped at it. The role made sense, as I was still doing the work, but was able to apply my extra knowledge to help other people. Nobody who knows me could've guessed I would enjoy that part of the role! Anyway, as part of the senior role I taught myself a bit of vba and made some Excel macros to help simplify our processes. After 9 months or so, I was offered a role as a "Continuous Improvement Officer" alongside Travis (another long suffering employee). Dorky friggin title, but basically it meant I could concentrate on building Access databases and other tools to help my department manage their workload. It was great fun building/coding these things then seeing 40 odd people getting a lot of value out of them. I like to think my skills in this area have progressed a hell of a lot in the last 9 months, to the point where I can throw something together in an afternoon what would have taken me a week.

Please note, that none of the learning I've done since 2004 has ever been about the company itself. I'm the last person to ask about who the big players are at IAG, or who is marrying whom, or who got fired for copying and selling DVDs on work time. I'm not interested, and to be on this project just pisses me off. I now have to know who else is involved, who they work for, how we interact with them… I've discovered too late that I don't like the high level stuff. If I didn't actually have to do anything and just had to offer my opinion, I reckon it would be fine. When I'm sent out to discover something like "Business Impacts", with nothing more than an email, I really worry that I'm going to fuck it up. What if I don't look at things in enough detail? What if I miss something obvious that will impact on this multi-million dollar project?

I miss being on the tools and being able to solve problems at the grass roots level. It's too late to back out of it now I suppose, but god I can't wait till it's over.